AMPLIFIER

• Main Author: SUMIYOSHI TAKASHI
• Format: Patent
• Language: English; Japanese
• Published: 13.05.2024
• Subjects: AMPLIFIERS; BASIC ELECTRONIC CIRCUITRY; ELECTRICITY

To provide an amplifier having a desired characteristic.SOLUTION: An amplifier 100 includes a first amplifier 10 for amplifying a first signal, a first matching circuit 32 whose first end is electrically connected to an output node of the first amplifier and whose second end is electrically connected to a first intermediate node, and a first transmission line whose first end is electrically connected to the first intermediate node and whose second end is electrically connected to the first output node, a first reactance component of impedance Zo1 seen at the first output node No1 toward the first transmission line is smaller than a second reactance component of impedance Zm1 seen at a first intermediate node Nm1 toward the first matching circuit at the center frequency of operation band, and at the center frequency, a first characteristic impedance of the first transmission line is 0.5 times or more and is 2 times or less of the absolute value of a first impedance seen at the second end toward the first matching circuit when the first end and the second end of the first matching circuit are terminated with reference impedance.SELECTED DRAWING: Figure 2 【課題】所望の特性を有する増幅器を提供する。【解決手段】増幅器１００は、第１信号を増幅する第１アンプ１０と、第１端が第１アンプの出力ノードに電気的に接続され、第２端が第１中間ノードに電気的に接続された第１整合回路３２と、第１端が第１中間ノードに電気的に接続され、第２端が第１出力ノードに電気的に接続された第１伝送線路と、を備え、動作帯域の中心周波数において、第１出力ノードＮｏ１から第１伝送線路を見たインピーダンスＺｏ１の第１リアクタンス成分は、第１中間ノードＮｍ１から第１整合回路をみたインピーダンスＺｍ１の第２リアクタンス成分より小さく、中心周波数において、第１伝送線路の第１特性インピーダンスは、第１整合回路の第１端および第２端を基準インピーダンスに終端したとき、第２端から第１整合回路を見た第１インピーダンスの絶対値の０．５倍以上かつ２倍以下である。【選択図】図２